Sodium measurements are useful in the diagnosis and treatment of aldosteronism, diabetes insipidus, adrenal hypertension, Addison's Disease, dehydration, inappropriate antidiuretic hormone secretion, or other diseases involving electrolyte imbalance.
Sodium is an essential electrolyte involved in several bodily functions. The kidneys regulate its level in the body. High or low levels can be seen in a number of diseases, and the level can be influenced either way by prescribed medication (e.g. diuretics can cause a drop-in sodium).